CN102711199B - Double-antenna handover system in GSM-R (global system for mobile communication for railway) network and method thereof - Google Patents
Double-antenna handover system in GSM-R (global system for mobile communication for railway) network and method thereof Download PDFInfo
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- CN102711199B CN102711199B CN201210111202.4A CN201210111202A CN102711199B CN 102711199 B CN102711199 B CN 102711199B CN 201210111202 A CN201210111202 A CN 201210111202A CN 102711199 B CN102711199 B CN 102711199B
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Abstract
The invention discloses a double-antenna handover system in the GSM-R (global system for mobile communication for railway) network and a method thereof. The double-antenna handover system comprises a head antenna provided with user identification codes, a tail antenna provided with user identification codes and a controller used for controlling received signals and transmitted signals of the head antenna and the tail antenna and handover of functions. By channel adjusting and coordinate of the head antenna and the tail antenna, seamless handover in the GSM-R network is realized, communication quality in the high-speed environment is greatly improved, and for a single-antenna handover process, time for transmitting measuring reports is shortened, and transmission efficiency is high.
Description
Technical field
The present invention relates to communication technical field, particularly, relate to double antenna cross-area switching system and method thereof in a kind of GSM-R network.
Background technology
Because high-speed railway is related to the safety of life and property of the people, along with the fast development of high-speed railway and applying of mobile Communication System for High Speed Railway, the research for the fail safe of high speed rail system is an emphasis problem in high-speed railway research field.And as the wireless communication system GSM-R in whole high-speed railway information system, due to the uncertainty of its wireless transmission, the security performance of GSM-R system causes the interest of numerous researcher.
Handover in GSM-R system refers to the process transferred to from current ongoing call or data transmission channel new channel.In high speed rail system, handover is the key technology in GSM-R mobile management, and it is the basis ensureing high-speed train ground uninterrupted communication.The research of handoff algorithm is an important content during GSM-R optimizes.Show according to statistics, the call drop caused by handover accounts for about 40% of whole system call drop.Therefore the improvement of handover switching performance is had great importance.
At present, there is scholar to be devoted to the research of GSM-R handoff techniques both at home and abroad, and a lot of prioritization scheme has been proposed to handoff algorithms and process.All make use of some characteristics in GSM-R network to carry out the optimal design of handoff algorithm in these research work.Li Ye utilizes the uniqueness of current of traffic in GSM-R network in its thesis for the doctorate " GSM-R system time distributed model and handover decision algorithm research ", proposes a kind of handover decision algorithm with random direction locking.This algorithm encourages handover decisions towards the direction of train operation, and adopts the parameter of genetic algorithm to a kind of self adaptation handover decision algorithm based on public network to be optimized, and makes it be applicable to GSM-R system, and wherein optimised parameter is responsive to train speed.Wu Hao etc. propose a kind of novel quick handoff algorithms being applicable to high-speed railway environment based on switching point statistical learning in " a kind of GSM-R quick handoff algorithms research being applied to high-speed railway " literary composition, improve the probability of success of handover between MSC under high velocity environment.But the precondition of this algorithm is very harsh, as train must install gps system, needs the place switched train to carry out a large amount of measurements and add up and require to carry out regular update.In addition, many work based target communities are also had to specify method and the method such as expert system or fuzzy system to improve the performance of handover in GSM-R system in prior art.
But, existingly all consider the particularity of GSM-R network for the research work of handover in GMS-R network, as the uniqueness of traffic direction, running orbit stationarity, run the particularity etc. of high speed and the network coverage, what realize is all direct-cut operation, namely all there is handover disruption.And along with the continuous lifting of high-speed railway speed, harsher to the requirement of communication system, and in the communication interruption time that handover causes, the distance of train operation is constantly elongated, the communication disruption problem therefore existed in handover procedure is an important potential safety hazard in high-speed railway.Prior art only by GSM-R running environment as the uniqueness of traffic direction, running orbit stationarity, run high speed and the network coverage particularity etc. make full use of the improvement carrying out handover switching performance, do not utilize the feature as the train of mobile communications nodes itself, as much bigger compared with common communications node in train length.How making full use of this feature to realize the space diversity characteristic of Received signal strength, and introduce double antenna to realize soft handover, to reduce the fail safe that handover improves GSM-R system break period, will be an important problem.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide double antenna cross-area switching system and method thereof in a kind of GSM-R network, it, by channel adjustment and head and the tail antenna coordinated, effectively achieves GSM-R network seamless handoff.
For achieving the above object, the invention provides double antenna cross-area switching system in a kind of GSM-R network, it comprises
First antenna, is provided with user identification code;
Tail antenna, is provided with user identification code;
Controller, its Received signal strength for first antenna shown in controlling, tail antenna, the switching sending signal and carry out function,
Wherein, described GSM-R network adopts full-service channel and mixed channel two kinds of channels;
Described full-service channel is only responsible for transmission data, and it does not comprise SACCH channel; Described mixed channel has the function of transmission data and switching simultaneously, and in described mixed channel, SACCH channel quantity is greater than 1.
Double antenna method of handover in GSM-R network described above, wherein, the user identification code of described first antenna and the user identification code of tail antenna interrelated.
Double antenna method of handover in GSM-R network described above, wherein, described full-service channel and mixed channel all adopt the multi-frame structure of 26 frames.
Double antenna method of handover in GSM-R network described above, wherein, the Visited Location Registor VLR of described GSM-R network control centre is used for picking out described first antenna and tail antenna by the user identification code of described first antenna and the user identification code of tail antenna.
Meanwhile, the present invention also provides the changing method of double antenna cross-area switching system in a kind of GSM-R network described above, and it comprises the following steps:
Described first antenna access mixed channel, is responsible for transmission measurement report, and its Traffic Channel temporary standby; Described tail antenna access full-service channel, is responsible for transmitting data information;
When train driving enters Liang Ge community juncture area, the measurement report that described first antenna sends will trigger handoff procedure in base station side, and described first antenna carries out channel switching; In the process activating channel, base station will prepare 2 full-service channels and 1 mixed channel in new community; Described first antenna discharges the mixed channel be connected with former community, accesses the full-service channel of new community; Meanwhile, described tail antenna is in former community, and keeps communication;
After described first antenna completes switching, base station receives the switching of described first antenna and release completes signaling, and the channel starting described tail antenna switches; Described tail antenna directly accesses the mixed channel of new community, discharges the full-service channel of former community; Transmitting data service is responsible for by described first antenna during this period of time;
After accessing new community, the mixed channel at described tail antenna place sends measurement report to base station, and base station is triggered described tail antenna switching channels again, made it be switched to full-service channel after judging that incoming level and power are suitable for communicating;
After described tail antenna access full-service channel, base station by described first tested rotating platform on mixed channel, make described tail antenna recover the function of transmitting data information, described first antenna is responsible for sending measurement report again, and the double antenna that train so far completes one-period switches.
The changing method of double antenna cross-area switching system in GSM-R network described above, wherein, in the handoff procedure of described tail antenna, described tail antenna does not need to carry out measuring process and trigger process, and its channel turned to is by activated in advance.
Relative to prior art, in GSM-R network of the present invention, double antenna method of handover has following useful technique effect:
(1) in GSM-R network double antenna handoff algorithm of the present invention, to the switching of first antenna, because measurement report sends frequently, pretreatment time reduces, therefore its switch decision accuracy improves, effectively reduce pingpang handoff number of times, simultaneously handoff procedure comparatively single antenna switch time delay and reduce about 2 seconds, and can immediately for communication after accessing new community; To the switching of tail antenna, due to without the need to carrying out measuring process and trigger process, and channel is by activated in advance, so its switching is very fast, only needs can complete for about 1 second.Can estimate according to train length and travel speed, head and the tail antenna arrives about 2 seconds time differences of switching position, can find out in conjunction with above-mentioned conclusion, utilize handoff algorithms of the present invention can ensure in head and the tail antenna handoff procedure, ensure an antenna and may be used for communication, so just achieve seamless switching; After head and the tail antenna accesses new community, because tail antenna is in cell boarder place, communication quality is poor, therefore can send measurement report after access mixed channel, judges whether its incoming level and power are suitable for communicating by base station.Once judgment condition is set up, trigger a new round and switch.This process ensure that the reset of head and the tail antenna connecting channel, and still ensures an antenna for switching.
(2) because whole handover procedure comprises two kinds of measurement reports, one is that first antenna sends, another is that tail antenna sends, and base station according to the judgment condition of user identification code identification two kinds of measurement reports of head and the tail antenna, thus can perform different switchings.For the measurement report that first antenna sends, the switching whether triggered from former community to new community will be adjudicated in base station; Tail antenna is then adjudicated whether be switched to full-service channel by mixed channel.
(3) in double antenna handover procedure, signaling is more loaded down with trivial details, and base station need more judge, be required to be double antenna with stylish community and prepare 3 idle channels to ensure carrying out smoothly of switching, these factors all can increase handover delay to a certain extent.But from the angle of seamless switching, double antenna handoff algorithms can promote the communication quality under high velocity environment greatly.
(4) compare traditional single antenna handoff algorithms, after two large line handoff algorithms adjustment logic channel, send the time shorten of measurement report, transmission frequency is high; Single antenna handoff procedure belongs to direct-cut operation, and double antenna achieves the seamless switching of GSM-R network.
Accompanying drawing explanation
Fig. 1 is the structural representation of double antenna cross-area switching system in GSM-R network of the present invention;
Fig. 2 is Traffic Channel multi-frame structure schematic diagram in GSM-R network single antenna cross-area switching system in prior art;
Fig. 3 is full-service channel multi-frame structure schematic diagram in double antenna cross-area switching system in GSM-R network of the present invention;
Fig. 4 is mixed service channel multi-frame structure schematic diagram in double antenna cross-area switching system in GSM-R network of the present invention;
Fig. 5 is the schematic diagram of double antenna handoff procedure-1 of the present invention;
Fig. 6 is the schematic diagram of double antenna handoff procedure-2 of the present invention;
Fig. 7 is the schematic diagram of double antenna handoff procedure-3 of the present invention;
Fig. 8 is the schematic diagram of double antenna handoff procedure-4 of the present invention;
Fig. 9 is the schematic diagram of double antenna handoff procedure-5 of the present invention.
Embodiment
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
As shown in Figure 1, in GSM-R network of the present invention, double antenna cross-area switching system is made up of the first antenna 101 being positioned at car head, the controller 103 of tail antenna 102 and two antennas that is positioned at the tailstock, wherein, first antenna 101 and tail antenna 102 are respectively arranged with different user identification code to distinguish, controller 103 be used for control two antenna receiving signals, send signal and carry out the switching of function.Particularly, the position residing for controller 103 judges according to the signal strength signal intensity received, in different positions, head and the tail antenna adopts different multi-frame channel models, cooperative achievement handover procedure.
In traditional single antenna handoff procedure, Traffic Channel is not only for transmitting data information, specific SACCH channel is also had to be responsible for sending measurement report, in hand-off execution process, Fast Associated Control Channel FACCH (Fast Associated Control Channel) can be placed in Traffic Channel and transmit necessary signaling.As shown in Figure 2, wherein T represents Traffic Channel, and A represents slow associated control channel SACCH (Slow Associated Control Channel), and I represents IDLE state.When GSM-R uses the multi-frame structure of 26 frames of about 120ms, in the multi-frame of 26 frames, except the 13rd frame is SACCH channel, be responsible for sending measurement report, all the other frames are all responsible for transmission data.Because a measurement report of complete process needs 4 SACCH frames, therefore need 480ms could generate a complete measurement report.In addition, in single antenna handover procedure, Traffic Channel had both been responsible for communication and had also been responsible for switching, thus caused service communication short interruption in decision process time longer and handoff procedure.
In GSM-R network of the present invention in double antenna cross-area switching system, original Traffic Channel is carried out structural adjustment, transmitting data information with switch two kinds of functions and distinguished in channel aspect, obtain two kinds of dissimilar Traffic Channels, i.e. full-service channel and mixed channel.
As shown in Figure 3, full-service channel is only responsible for transmission data, and the SACCH channel of the 13rd frame is adjusted to Traffic Channel.
As shown in Figure 4, mixed channel has the function of transmission data and switching simultaneously, and wherein, SACCH channel quantity increases to some extent, and the frequency sending measurement report also increases.According to traditional handoff algorithms, such adjustment effectively can reduce the pretreatment time triggered in switching.
In double antenna method of handover, due to the increase of antenna amount and channel kind, switching flow is also more complicated.Double antenna must switch flexibly at two kinds of interchannels, ensures that communication is smooth.See Fig. 5 to Fig. 9, in GSM-R network, the specific implementation flow process of double antenna handover is as follows:
For ensureing the carrying out of handoff procedure, the user identification code (IMSI) of head and the tail antenna should have association, namely when accessing GSM-R network, the Visited Location Registor VLR of the network control center can pick out head and the tail antenna in authentication process, like this in handoff procedure, the specification that base station transceiver (BTS), base station control center (BSC), mobile switching centre (MSC) can switch according to double antenna and agreement and travelling carriage (MS) carry out Signalling exchange, ensure the execution of switching.
Assuming that the user identification code of first antenna is 101, tail antenna is 102, when train driving is in cell coverage area, and as shown in Figure 5, first antenna 101 accesses mixed channel 111, is responsible for transmission measurement report, and its Traffic Channel temporary standby; And tail antenna 2 accesses full-service channel 112, be responsible for transmitting data information.
When train driving enters Liang Ge community juncture area, as shown in Figure 6, the measurement report that first antenna 101 sends will trigger handoff procedure in base station side, so first antenna 101 will take the lead in switching, its process and conventional single-antenna switch substantially identical, but in the process activating channel, base station will prepare 2 full-service channels 112 and 1 mixed channel 111 in new community.First antenna 101, by discharging the mixed channel 111 be connected with former community, accesses the full-service channel 112 of new community.Meanwhile, tail antenna 102 is still in former community, therefore keeps communication.
After first antenna 101 has switched, base station has received the switching of first antenna 101 and release completes signaling, then starts the switching of tail antenna 102, as shown in Figure 7.Tail antenna 102 directly accesses the mixed channel 111 of new community, discharges the full-service channel 112 of former community.Because first antenna 101 is at new community access full-service channel 112, during this period of time, be responsible for transmitting data service by first antenna 101.
In handoff procedure, because tail antenna 102 does not need to carry out measuring process and trigger process, and its channel turned to is by activated in advance, therefore it is very rapid to complete switching.As shown in Figure 8, after considering the new community of access, the level that tail antenna receives and underpower are to communicate, so the mixed channel 111 at tail antenna 102 place sends measurement report to base station, after base station judges that incoming level and power are suitable for communicating, trigger the switching of tail antenna 102 again, make it be switched to full-service channel 112.
Preparing what a unnecessary full-service channel 112 owing to activating the stylish community of channel, so tail antenna 102 directly accesses full-service channel 112 when this time switching, having vacated the mixed channel 111 originally occupied.After tail antenna 102 has accessed, first antenna 101 is adjusted on mixed channel 111 by base station, and such tail antenna 102 has recovered the function of transmitting data information, and first antenna 101 is also responsible for sending measurement report again, the double antenna that train so far completes one-period switches, as shown in Figure 9.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection range of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (6)
1. a double antenna cross-area switching system in GSM-R network, is characterized in that, comprise
First antenna, is provided with user identification code;
Tail antenna, is provided with user identification code;
Controller, its Received signal strength for first antenna shown in controlling, tail antenna, the switching sending signal and carry out function,
Wherein, described GSM-R network adopts full-service channel and mixed channel two kinds of channels;
Described full-service channel is only responsible for transmission data, and it does not comprise SACCH channel; Described mixed channel has the function of transmission data and switching simultaneously, and in described mixed channel, SACCH channel quantity is greater than 1;
For the measurement report that described first antenna sends, whether base station judgement triggers switching; For the measurement report that described tail antenna sends, whether base station judgement is switched to described full-service channel by described mixed channel;
Switch if triggered, in the process activating channel, described base station will prepare 2 full-service channels and 1 mixed channel in new community, described first antenna discharges the mixed channel be connected with former community, accesses the described full-service channel of new community;
After described first antenna has switched, described tail antenna has directly accessed the mixed channel of new community, discharges the full-service channel of described former community;
Base station described in described tail sky alignment sends measurement report, and base station is triggered the switching of described tail antenna again, made it be switched to described full-service channel after judging that incoming level and power are suitable for communicating;
Described base station by described first tested rotating platform on described mixed channel.
2. double antenna cross-area switching system in GSM-R network as claimed in claim 1, is characterized in that, the user identification code of described first antenna and the user identification code of tail antenna interrelated.
3. double antenna cross-area switching system in GSM-R network as claimed in claim 1, it is characterized in that, described full-service channel and mixed channel all adopt the multi-frame structure of 26 frames.
4. double antenna cross-area switching system in GSM-R network as claimed in claim 1, it is characterized in that, the Visited Location Registor VLR of described GSM-R network control centre is used for picking out described first antenna and tail antenna by the user identification code of described first antenna and the user identification code of tail antenna.
5. in the GSM-R network as described in one of claim 1-4, a changing method for double antenna cross-area switching system, is characterized in that, comprises the following steps:
Described first antenna access mixed channel, is responsible for transmission measurement report, and its Traffic Channel temporary standby; Described tail antenna access full-service channel, is responsible for transmitting data information;
When train driving enters Liang Ge community juncture area, the measurement report that described first antenna sends will trigger handoff procedure in base station side, and described first antenna carries out channel switching; In the process activating channel, base station will prepare 2 full-service channels and 1 mixed channel in new community; Described first antenna discharges the mixed channel be connected with former community, accesses the full-service channel of new community; Meanwhile, described tail antenna is in former community, and keeps communication;
After described first antenna completes switching, base station receives the switching of described first antenna and release completes signaling, and the channel starting described tail antenna switches; Described tail antenna directly accesses the mixed channel of new community, discharges the full-service channel of former community; Transmitting data service is responsible for by described first antenna during this period of time;
After accessing new community, the mixed channel at described tail antenna place sends measurement report to base station, and base station is triggered described tail antenna switching channels again, made it be switched to full-service channel after judging that incoming level and power are suitable for communicating;
After described tail antenna access full-service channel, base station by described first tested rotating platform on mixed channel, make described tail antenna recover the function of transmitting data information, described first antenna is responsible for sending measurement report again, and the double antenna that train so far completes one-period switches.
6. the changing method of double antenna cross-area switching system in GSM-R network as claimed in claim 5, it is characterized in that, in the handoff procedure of described tail antenna, described tail antenna does not need to carry out measuring process and trigger process, and its channel turned to is by activated in advance.
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| CN103916918A (en) * | 2014-03-07 | 2014-07-09 | 北京交通大学 | Chain covering double-link mobile communication system and wave beam diversity and relay switching method |
| CN107801224B (en) * | 2016-09-01 | 2020-02-14 | 深圳市中兴微电子技术有限公司 | WCDMA system double-antenna measuring method and device |
| WO2018120462A1 (en) * | 2016-12-29 | 2018-07-05 | 华为技术有限公司 | Antenna group switching method and related device thereof |
| CN111246429B (en) * | 2020-01-15 | 2022-08-26 | 北京锦鸿希电信息技术股份有限公司 | GSM-R handover switching method and device based on redundant network |
| US11399320B2 (en) | 2020-08-03 | 2022-07-26 | Blue Ocean Robotics Aps | Methods of connecting to communications networks and switching network connectivity |
| US20240039597A1 (en) * | 2021-08-05 | 2024-02-01 | Apple Inc. | Csi report enhancement for high-speed train scenarios |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1284789A (en) * | 1999-08-17 | 2001-02-21 | 株式会社村田制作所 | Electronic element with conductor and lead terminal |
| CN102413520A (en) * | 2011-09-29 | 2012-04-11 | 中国科学院计算技术研究所 | Switching method in long term evolution (LTE) communication system facing high speed railway and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284789A (en) * | 1999-08-17 | 2001-02-21 | 株式会社村田制作所 | Electronic element with conductor and lead terminal |
| CN102413520A (en) * | 2011-09-29 | 2012-04-11 | 中国科学院计算技术研究所 | Switching method in long term evolution (LTE) communication system facing high speed railway and system thereof |
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